Re: Plotting in a dynamic environment.

*To*: mathgroup at smc.vnet.net*Subject*: [mg99647] Re: Plotting in a dynamic environment.*From*: Helen Read <hpr at together.net>*Date*: Sun, 10 May 2009 05:15:55 -0400 (EDT)*References*: <gu3at0$t8t$1@smc.vnet.net>*Reply-to*: HPR <read at math.uvm.edu>

mgoic wrote: > Hi everyone, > > I am having problems when trying to plot an expression in a Dynamic > model using manipulate tool. For example, in this simple code I can > plot the function (first plot), I can evaluate its value in a > manipulate environment (second plot), but when trying to plot in a > dynamic environment I just get empty axis (third plot). > > myfun = x^2 + 3 t x ; > t = 1; > Plot[myfun, {x, 0, 2}] > Clear[t] > Manipulate[Evaluate[myfun], {x, 1, 2}, {{t, 1}, 0, 10}] > Manipulate[Plot[Evaluate[myfun], {x, 1, 2}], {{t, 1}, 0, 10}] > > Any idea of what I am doing wrong? I will really appreciate any > guidance. You need to define your function *as a function* of x and t. f[x_, t_] := x^2 + 3 t x Manipulate[Plot[f[x, t], {x, 1, 2}], {{t, 1}, 0, 10}] I'd also suggest setting a PlotRange so that the plot doesn't jerk around when you Manipulate t. For instance: Manipulate[Plot[f[x, t], {x, -10, 10}, PlotRange -> {{-10, 10}, {-50, 50}}], {t, 0, 10}] -- Helen Read University of Vermont